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Non-volatile memory and method with block management system

Active Publication Date: 2005-06-30
SANDISK TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] The efficient use of system resource allows multiple logical groups to be updated concurrently. This further increases efficiency and reduces overheads.

Problems solved by technology

Thus, when a logical group is being updated, the distribution of logical units (and also the scatter of memory units that the updates obsolete) are limited in range.

Method used

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  • Non-volatile memory and method with block management system
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  • Non-volatile memory and method with block management system

Examples

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Embodiment Construction

[0055]FIG. 1 illustrates schematically the main hardware components of a memory system suitable for implementing the present invention. The memory system 20 typically operates with a host 10 through a host interface. The memory system is typically in the form of a memory card or an embedded memory system. The memory system 20 includes a memory 200 whose operations are controlled by a controller 100. The memory 200 comprises of one or more array of non-volatile memory cells distributed over one or more integrated circuit chip. The controller 100 includes an interface 110, a processor 120, an optional coprocessor 121, ROM 122 (read-only-memory), RAM 130 (random access memory) and optionally programmable nonvolatile memory 124. The interface 110 has one component interfacing the controller to a host and another component interfacing to the memory 200. Firmware stored in nonvolatile ROM 122 and / or the optional nonvolatile memory 124 provides codes for the processor 120 to implement the ...

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Abstract

A non-volatile memory system is organized in physical groups of physical memory locations. Each physical group (metablock) is erasable as a unit and can be used to store a logical group of data. A memory management system allows for update of a logical group of data by allocating a metablock dedicated to recording the update data of the logical group. The update metablock records update data in the order received and has no restriction on whether the recording is in the correct logical order as originally stored (sequential) or not (chaotic). Eventually the update metablock is closed to further recording. One of several processes will take place, but will ultimately end up with a fully filled metablock in the correct order which replaces the original metablock. In the chaotic case, directory data is maintained in the non-volatile memory in a manner that is conducive to frequent updates. The system supports multiple logical groups being updated concurrently.

Description

FIELD OF THE INVENTION [0001] This invention relates generally to non-volatile semiconductor memory and specifically to those having a memory block management system. BACKGROUND OF THE INVENTION [0002] Solid-state memory capable of nonvolatile storage of charge, particularly in the form of EEPROM and flash EEPROM packaged as a small form factor card, has recently become the storage of choice in a variety of mobile and handheld devices, notably information appliances and consumer electronics products. Unlike RAM (random access memory) that is also solid-state memory, flash memory is non-volatile, and retaining its stored data even after power is turned off. Also, unlike ROM (read only memory), flash memory is rewritable similar to a disk storage device. In spite of the higher cost, flash memory is increasingly being used in mass storage applications. Conventional mass storage, based on rotating magnetic medium such as hard drives and floppy disks, is unsuitable for the mobile and han...

Claims

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Application Information

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IPC IPC(8): G06F11/20G06F12/02G11C7/00G11C11/56G11C16/10G11C16/34G11C29/00
CPCG06F11/1072G11C2211/5641G06F11/1415G06F11/1658G06F11/1666G06F12/0246G06F2212/7202G06F2212/7203G06F2212/7205G06F2212/7208G11C11/5621G11C11/5628G11C16/102G11C16/105G11C16/20G11C29/00G11C29/76G06F11/141G11C16/16G11C16/10
Inventor BENNETT, ALAN DAVIDBRYCE, ALAN DOUGLASGOROBETS, SERGEYSINCLAIR, ALAN WELSHSMITH, PETER JOHN
Owner SANDISK TECH LLC
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